Phase One - "Make it right"

[itsdouges]

We will probably just release under a random name initially to start testing this internally at Atlassian. Other than that we have a few things to do for the first phase of the library.

We've made it work from the spike and proven this can work. Now it's about getting it in a state that can be used in production for Atlaskit.

• decide package name
• css api all tests pass
• styled api all tests pass
• class names api all tests pass
• prefix transformer option for class/css-variables
• const blowing up bug fixed see EmitResolver cannot handle JsxOpeningLikeElement and JsxOpeningFragment that didn't originate from the parse tree microsoft/TypeScript#35686
• performance benchmarking

[itsdouges]

Moved this into a milestone